Concrete-steel construction.



PATENTBD MAR. 20, 1906.

W. MUE8ER CONCRETE STEEL CONSTRUCTION.

APPLICATIGN FILED JUNE 23, 1905.

WILLIAM MUESER, OF NEW YORK, N. Y.

CONCRETE-STEEL CONSTRUCTlON.

Specification of Letters Patent.

Patented March 20, 1906.

Original application filed Apri120,1906,8arlnl No. 256,579. Divided and this application filed June 28, 1995. Serial No. 268,624.

I 0 mil whom it may concern:

Be it known that 1, WILLIAM Musssn, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certein new and useful Improvements in Concretefiteel Construction, of which the following is s specificstion.

My invention relates to concrete-steel constrnction; and its novelty consists in the construction and adaptation of the parts, as will be more full hereinafter pointed out.

In an app ication for Letters Patent of the United States filed b me October 13, 1904, Serial No. 228,342, have shown and described a form of bar adapted to be embedded in concrete and to fofm s unitery structure with its concrete envelop, which her comprises a lon 'itudinal b dy provided with external spirally-arrange ribs, whereby a resistance is afforded to the movement of the bar within the concrete envelop and yet at the same time the cross-sectional area. of the bar in a plane at right angles to its longitudinel axis is substantially constant and of uniform character, and therefore the tensile strength of the bar and, what is more important its elongation under stress is suplstantielly uniform at all points along its e th.

11 another a plicetion filed by me April 20,1905, Serial No. 256,579, of which the present op licetion is a division, I have shown sun ry modifications of the bar of the application before referred to. The subj ectmatter of this present application also corn Erises sundry modifications of this form of er, and has for its object the produetionsfs bar which, while varying somewhat in form and roportions from those described in the epphcations referred to, iyjct possesses thegd" vantages of such bars, w is at the sometime it has other advantages peculiar to itself'end may perhaps be more readily manufactured,

In the drawings, Fi ure 1 is a. longitudinal elevation of a bar emfiodying my invention, showing the concrete envelop in section in two planes, the outline of the her being shown dotted where it is concealed. Figs. 2, 3, and 4 are transverse sections at right angles to the lo itudinal axis of the her on the planes of the lines 2 2 3 3, and 4 4 in Fig. 1.

lg. 5 is a longitudinal elevation of the same bar, showing the modification or distortion which =:"s in its shape when the two rolls through which it is formed do not exactly register while this operation is taking place; and Figs. 6, 7, and S are transverse sections at right angles to the ion itudinal axis of the bar on the planes of t e lines 6 6, 7 7, and 8 8 in Fig. 5.

The drawings represent a bar of metal, preferably iron or steel, which has been rolled or otherwise fashioned into the forms shown. It comprises a lon itudinal body 21 of symrnetrical form an provided with external ribs 22 23, and 24, variously disposed around and projecting from the body 21. The bod 21 is shown in the illustrations as along cy index; but it may well have any polygonal shape in cross-section so long as its transverse sectional area is uniform at all points. The external ribs 22, 23, and 24 are refersbly made integral with the bod of t e her. Their size contrasted with the hody of the bar may be varied to suit differentcirenm stances of use, but .ebout the proportions shown in the drawings are usual and convenient. In cross-section each one of these ribs above the body of the bar resembles somewhat the she e of an ordinary tooth of toothed gearing. lhe ribs are each arranged symmetrically with reference to the longitudinalsxisof the bar.

Referring specifically to Figs. 1 to 4, 22 and 23 are ribs spiral arranged around the body of the bar, worm in the same directions nraliel with each other. Coincident with onealf of these points of intersection and ar- 1' ed on diametrically op osite sides of the h s??? 21 sretwo longitudinal ribs 24 24, which are substsntiall parallel with the central ionitudinel axis 0 the bar. it will be seen by his arrangement spaces roughly diamondshaped are left between the ribs. These s aces are adapted to receive and do receive t e concrete and assist in holding the bar and its envelo to ether after they are once in place. lo will of course be understood t mt three or more would serve equally well.

The bar made as described has substantially the same cross-sectional area in all lanes at ri ht s ice to its longitudinal axis. eorcticsl st-t e angles formed by the intersection oi the longitudinal ribs with the s iral ribs this cross-sectional area would he s ightly less than elsewhere, and in order to compensate for such decrease in area the angle of intersection is rounded out slightly and a. little more metal is lei t at that point, so as to make the sectional area of the bar at that show two 5 int] ribs only,it

point uniform with that at the other points along its length. Another matter .to be noted is that all oblique sections of the bar are greater in area than the transverse rightangled section, and consequently this area of uniform section represents the minimum strength of the bar. It cannot twist nor cannot ull out of the concrete, and the longitudina l ribs prevent it from rotatin How the cross-sectional area remains uni orm is seen from an examination of Figs. 2, 3, and 4. In Fig. 2 it is seen that the ribs 22 and 24 coalesce on one side of the bar and the ribs 23 and .24 on the other, forming a single projecting body on each side of substantially double the thickness of a single rib. In Figs. 3 and 4 they are all shown as separated; but their combined area is the same, of course, asit was in Fig. 2, in each of these figures their area being identical.

In Fi s. 5, 6, 7, and 8 there is shown a modified form of the bar illustrated in the receding figures. It happens in rolling the ar that sometimes the two rolls employed are not registered with sullicient care and the upper half of the bar is not in precise sym metrical relation with the lower half of the bar. In Fig. 5 this is shown in sli htly-exaggerated form in order to make tie situa tion clear. This non-registration of the rolls is apt to occur, and it has occurred frequentlv in every rolling-mill and is a dilliculty which iron-masters have long sought to overcome, but have not overcome except at an expense entirely disproportionate to the result sought to be obtained. When a bar of my improved form, however, is employed it makes no difference whether the rolls reg ster or not, because the cross-sectional area of the bar at all points will be found to be the same, even though such registration does not take place. How this occurs is fully illustrated in Figs. 6, 7, and 8, showing cross-sections of the bar illustrated in Fig. 5. By these sections it will be seen that while the ribs 22, 23, and 24 are not at any place symmetrically arranged around the periphery of the intersecting circular plane, yet nevertheless their combined area is outside of the body of the bar, and consequently the cross-sectional area of the entire bar at all of these points is at all times the same.

Having in view the principles governing the construction of this form of concrete barnamely, that the body of the bar shall be of s unmetrical form and that the external ribs s all be symmetrically placed about such form-it will be relatively easy for those skilled in the art to which the invention relates to make other modifications in the form of the bar while still practicing the principles of the invention.

What I claim is- 1. A bar adapted to be used as a core to be embedded in a concrete envelop comprising a regularly-formed central body and provided with external projecting ribs of uniform crosssection, extending a substantial part of the length of the bar, one of said ribs being substantially parallel to the longitudinal axis of the body, and a plurality of said ribs extending continuously around the body diagonally in the same direction and in parallel lines.

2. A bar adapted to be used as a core to be embedded in a concrete envelop, comprising a regularly-formed central body, and provided with external projecting ribs of uniform cross-section, extending a substantial part of the len th of the bar, one of said ribs being substantially parallel to thelongitu'dinal axis of the body, and a plurality of said ribs extending continuously around the body diagonally m aralle] lines and intersecting said longitudina rib.

3. A bar adapted to be used as a core to be embedded in a concrete envelop comprisin a regularly-formed central body, and provi ed with external projecting ribs of uniform crosssection, extending a substantial part of the length of the body, one of said ribs being substantially parallel to the longitudinal axis of the body, and a plurality of said ribs extending continuously around the body diagonally in parallel lines and intersecting said longitudinal ribs, the ribs being slightly enlarged in transverse section at the points of intersection in order to maintain a uniform cross-sectional area throughout the bar.

4. A bar adapted to be used as a core to be embedded in a concrete envelop comprising a regularly-formed central body and provided with external projecting ribs of uniform crosssection, extending a substantial part of the length of the body, a plurality of said ribs being substantially parallel to the longitudinal axis of the body, and another plurality extending continuously around the body diago nally in parallel lines.

5. A bar adapted to be used as a core to be embedded in a concrete envelop comprising a regularly-formed central body and provided with external projectin ribs of uniform crosssection extending a su stantial part of the length of the body, a plurality of said ribs being substantially parallel to the longitudinal axis of the body, and another plurality extending continuously around the body dia onallyin arallel lines and intersecting said p urality o longitudinal ribs.

6. A bar adapted to be used as a core to be embedded in a concrete envelop, comprising a regularly-formed central body, and provided with external projecting ribs of uniform crosssection, extending a substantial part of the length of the body, a plurality of said ribs being substantially parallel to the longitudinal axis of the body, and another plurality extending continuously around the body diagonally in parallel lines and intersecting said plurality of longitudinal ribs, the ribs being slightly enlarged in transverse section at the points of intersection, in order to maintain a uniform cross-sectional area throughout the bar.

7. A bar adapted to be used as a core to be embedded in a concrete envelop, comprising a regularly-formed central body and provided with external projecting ribs of uniform crosssection, extending a substantial part of the length of the body, one of said ribs bein substantially parallel to the ion itudina axis of the body, and a plurality 0' said ribs extending continuously around the body arallel to each other and diagonally to the ongitudinal axis of the body.

8. A bar adapted to be used as a core to be embedded in a concrete envelop comprising a regularly-formed central body and provided with external projectin ribs, extending a substantial part of the ength of the body, one of said ribs being substantially parallel to the ion itudinal axis of the body, and another 0 said ribs extending diagonally and continuously around the body in the same di reotion, and intersecting the longitudinal rib.

9. A bar adapted to be used as a core to be embedded in a concrete envelop comprising a regularly-formed central body and provided with external pro'eeting ribs, extending a substantial part 0 the ength of the body, one of said ribs being substantially parallel to the longitudinal axis of the body, and another of said ribs extending spirally around the body in the same direction and interseoting the longitudinal rib.

10, A bar adapted to be used asaeore to be embedded in a concrete envelop comprising a regularly-formed central body and rovided with external fprojecting ribs, exten ing a substantialpart o the length of the body, a plurality of said ribs being substantially parallel to the longitudinal axis of the bod and another of said ribs extendin diagonally and continuously around the be y and in tersectin the longitudinal ribs.

n testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM MUESER.

Witnesses HERMAN MEYER, ALAN G. MoDoNnnLL. 

